Is there a way to add a Figma image via URL in the documentation blocks?

Yes, it is now possible to add Figma image URL directly in the Image and Figma image blocks. Image block lets you add a new Figma layer by URL, or to upload an image file directly from your computer. Image can be either selected in the file selection dialog, or with a simple drag and drop using the drop zone. Figma images block lets you add a new Figma image by URL, or select a Figma image from already imported Figma designs.